What is the molecular weight of the acetic acid #(CH_3CO_2H)#, rounded to the nearest integer?

1 Answer
Dec 30, 2015

Answer:

#"M"_r("CH"_3"CO"_2"H") = 60#

#M("CH"_3"CO"_2"H") = 60"g/mol"# OR #60"g"*"mol"^(-1)#

Explanation:

Given that:

#"Relative Atomic Mass"("A"_r)("H")=1#
#"A"_r("C") = 12#
#"A"_r("O") = 16#

#"Relative Molecular Mass"("M"_r)("CH"_3"CO"_2"H") = 4xx"A"_r("H") + 2xx"A"_r("C") + 2xx"A"_r("O")#
#"M"_r("CH"_3"CO"_2"H") = (4xx1) + (2xx12) + (2xx16)#
#"M"_r("CH"_3"CO"_2"H") = 4 + 24 + 32#
#"M"_r("CH"_3"CO"_2"H") = 60#

Finally, acetic acid's relative molecular mass expressed as a molar mass:

#M("CH"_3"CO"_2"H") = 60"g/mol"# OR #60"g"*"mol"^(-1)#